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<form enctype="multipart/form-data" action="http://example.com" method
+="post">
    <input type="file" size="50" name="file_0"/><br /><br />
    <input type="submit" value="Attach File(s)" name="confirm"/>
</form>

use strict;
use warnings;
...
$request->authorization_basic('username', 'password');
my $response = $userAgent->request($request);
print $response->error_as_HTML . "\n" if $response->is_error;